java - JPA Join using arbitrary field (not primary key) -


i've got 2 entities want join using field have in common, called shared_id. field not primary key of either entity. shared_id unique - each hipster have unique shared_id.

the tables like:

hipster    fixie =========  ======== id         id shared_id  shared_id

there onetomany relationship between hipsters , fixies. i've tried this:

@entity public class hipster {      @id     @column(name = "id")     private integer id;      @column(name = "shared_id")     private integer sharedid;      @onetomany(mappedby = "hipster")     private list<fixie> fixies; }  @entity public class fixie {      @id     @column(name = "id")     private integer id;      @manytoone     @joincolumn(name = "shared_id", referencedcolumnname = "shared_id")     private hipster hipster; }  @repository public class hipsterdao {      @persistencecontext     private entitymanager entitymanager;      public hipster gethipsterbysharedid(integer sharedid) {          string querystring = "select h hipster h h.sharedid = :sharedid";         typedquery<hipster> query = entitymanager.createquery(querystring, hipster.class);          query.setparameter("sharedid", sharedid);         try {             return query.getsingleresult();         } catch (persistenceexception e) {             return null;         }     } }

now, dao gives me error: 

java.lang.illegalargumentexception: can not set java.lang.integer field hipster.sharedid java.lang.integer

i think it's upset because sharedid field used in relation, rather being basic field. haven't included sharedid field in fixie entity, same result if do. how persuade run query me? need change query or entities?


Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more